The ex-wife of Angus Sinclair has described the World's End murderer as "polite, kind and considerate" during their marriage.
Speaking in her first ever TV interview, Sarah Sinclair also claims the killer was responsible for "ten years of mayhem" killing women around Glasgow.
Angus Sinclair found guilty of World's End murders
It comes as detectives in the ITV series The Investigator: A British Crime Story, claim to have found new links between Sinclair and the murder of three Glasgow women — Hilda McAuley, Agnes Cooney and Anna Kenny.
One of Scotland's longest-serving prisoners, Sinclair has only been tried for the deaths of Helen Scott and Christine Eadie, whom he raped and strangled after a night out at the World's End pub in Edinburgh in 1977.
Undated Lothian and Borders Police handout photos of Christine Eadie (left) and Helen Scott, who were found dead the day after they visited World's End pub in Edinburgh in October 1977.
However, he has been linked to numerous other cases.
In the second episode of the ITV series, which aired last night, retired Detective Mark Williams-Thomas spoke to the killer's former wife, Sarah.
Speaking on the programme with her identity hidden, the "incredibly nervous and very private person" said she was speaking on air for the first time because she didn't know why Sinclair "has never been charged with everything, everything that he has ever done".
Sinclair's wife secretly worked with World's End detectives
Sinclair was 25 when he married Sarah Sinclair, then Hamilton, from Townhead in Glasgow in 1970. She was 20 and a trainee nurse.
They had met two years prior, just after Sinclair had served six years for the culpable homicide of his eight-year-old neighbour Catherine Reehill in Glasgow.
His former wife said: "He was very polite, he was very kind, considerate. I was just really happy."
Describing his routine when he would come home from his work as a painter and decorator, she said: "He would sit down and have his tea.
"If I was watching television he would read his newspapers. He used to read the papers cover to cover. Not just one, various newspapers. He was an easy man to live with."
She describes how Sinclair would disappear at weekends in a Toyota Hiace caravanette, which she now believes he used to abduct and kill many women.
She said: "Angus started going back and forth to Edinburgh every weekend, said that he was going to do extra work painting and decorating. I might possibly see him the Sunday night or the Monday. I wouldn't hear from him."
She added: "I don't believe that he ever stopped. They seemed to think he had a period of time where he went on a spree. I think he was ten years of mayhem in the city of Glasgow."
World’s End murderer Angus Sinclair's secrets may die with him
Detectives have long suspected that Sinclair also killed Anna Kenny, Agnes Cooney and Hilda McAuley, who were all abducted and brutally killed in similar circumstances within four months of each other in Glasgow in 1977.
William-Thomas claims that fresh clues now link Sinclair to the trio killings, after attempting to place the caravanette at all three of the crime scenes.
In the programme, he speaks to an eyewitness who placed Sinclair at the site where one of the bodies was found, which would be crucial evidence for his case.
Mark Williams-Thomas, The Investigator: A British Crime Story ITV 9pm
The former detective said: "My investigation shows that the manner in which the Glasgow three were killed bears all the hallmarks of the World’s End murders in Edinburgh - for which Angus Sinclair was convicted.
"I can place Sinclair or his caravanette at all three Glasgow crime scenes, which means I believe Sinclair could be responsible for the abduction and murder of Anna Kenny, Hilda McCauley and Agnes Cooney."
In 2016, alongside the release of BBC documentary The Forgotten Women, former detective also said there was strong evidence to support the claim that Sinclair was also responsible for the death of Glasgow woman Frances Barker.
Last year, the Herald reported the fears that Sinclair would never reveal information about any further victims, after reports of his failing health in prison.
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